|  | 8.3 | Environmental Factors
| 8.3.3 | EMI and RFI
Other sources of problems with network communications can actually be the equipment itself. Computer components, such as power supplies and monitors, as well as fluorescent lights, large electric motors, and electrical wiring, can cause Electro-Magnetic Interference (EMI) and Radio Frequency Interference (RFI) that can be picked up by other equipment and improperly shielded cables. Components of a device might be failing, but those components make it look like another part is causing the problem. These types of problems can be very difficult to diagnose, and as is shown later in the chapter are usually discovered by the use of diagnostic software and hardware.